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Signalling

A121 Alarm Horn Sounder 2-21-090

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The A121 is a very high output 124dB(A) automatically synchronised alarm horn sounder. Globally approved for fire, marine and general signalling applications. Featuring 64 alarm tones and 4 remotely activated stages.
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Voltage
Back box/cable entries
Stopping plug material
Equip. tag/Duty label
Product version
Product option
Enclosure
Part Number:
A121
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Alarm Horn Sounder

Upgraded Product:

  • Upgrade to current A121
  • 64 alarm tones
  • 4 remotely activated alarm stages
  • Low in-rush
  • Auto-synchronised output
  • Pluggable, duplicated cable terminals
  • Tropicalised electronics
  • Dual cable entries with stopping plugs
  • Globally approved for fire, marine and general signalling

Description

Low current consumption and high SPL in a outdoor rated enclosure ensure the A121 is suitable for all applications including fire, security and process control. Designed to withstand the harshest of environments. Constructed from lightweight, impact and fire-resistant ABS, the A121 employs the latest in reliable D Class amplifier technology for superior sound output with low current consumption. The A121 is a member of the versatile AlertAlarm family of industrial alarm horn sounders – also available with Xenon, AL121X or LED beacons, AL121H. SIL1 & SIL2 Route 2H compliant to IEC61508 (2010) as standard.

Downloads

Datasheet Datasheet.pdf
Installation Manual D221-01-051-IS_Issue_8__A121_.pdf
UL certificate of compliance UL_CoC_-_20210430-S7995_ALERTALARM.pdf
EC CPR Certificate 2821-CPR-0108_-_A112N_A121.pdf
UK CPR Certificate 0843-CPR-1006_-_A112N_A121.pdf
CSFM Listing CSFM_Listing_2279-0513_A-Series_2025.pdf
UL EU Certificate EN54-3 UL-EU-01153-CPR__A112N_A121_.pdf
Russian EAC Declaration of Conformity D-GB.G05..12595-20-24.03.2025.pdf
Russian Fire certificate EAC_Certificate_043_TR_CU-.00291.pdf
Russian Maritime register 19.00193.278.pdf
MED certificate MEDB000074G-R3.pdf
DNV MED Module D cert MEDD00000GV-R5.pdf
DNV Type Approval TAA00002ZU.pdf
USCG Approval USCG_-_COA_161-002-68-0_A105N__A112N__A121_15-06-2027.pdf
MER certificate MERB000074G.pdf
UAE Civil Defence UAE_Civil_Defence_CoC_ULSZ_UVAV.S7995.pdf
Ingress Protection certificate 58D22760E_IP66_certificate_-_A121.pdf
Declaration of Conformity DC-083_Issue_A_AlertAlarm.pdf
Declaration of Conformity UKCA DC-085_Issue_A_UKCA_AlertAlarm.pdf
SIL Certificate: Product version [A] T1072-215-2_SIL2_SIL1_2H__D1xS_D1xC_STExS_STExC_GNExS_A112N_AL112N_A121_AL121_MA_.pdf
Declaration of Performance DP_-_2821-CPR-0108-Issue_C_A112N_A121.pdf
2D drawing (PDF) D221-05-051_Issue_A.pdf
2D drawing (DWG) D221-05-051_Issue_A.DWG
3D drawing (STEP) D221-05-051-3D_Issue_A.STEP
Wiring Schematic DC voltage D221-06-001_Issue_C.pdf
Wiring Schematic AC voltage D221-06-005_Issue_B.pdf

Features

  • Automatic synchronisation
  • Continuously rated
  • Dual M20 or 1/2"NPT clearance cable entries
  • Duplicate pluggable cable terminations – Class A
  • Ingress protection IP66 Type 4/4X/13/3R
  • Conformal coated (tropicalised) electronics
  • 64 alarm tone frequencies and 4 remotely activated alarm stages
  • Available with custom tone configurations and frequencies
  • Diode polarized for use in supervised circuits

Specification

Maximum output: High power level: 124dB(A) @ 1 m ±3dB
[115dB(A) @ 10ft/3m ±3dB]
Default power level: 121dB(A) @ 1 m ±3dB
[112dB(A) @ 10ft/3m ±3dB]
Nominal output: High power level: 121dB(A) @ 1m ±3dB
[112dB(A) @ 10ft/3m] ±3dB
Default power level: 118dB(A) @ 1m ±3dB
[109dB(A) @ 10ft/3m ±3dB]
No. of tones: 64 (UKOOA / PFEER compliant)
No. of stages: 4
Volume control: Full range to 0dB(A)
Effective range: High power level: 323m/1062ft @ 1KHz
Default power level: 221m/726ft @ 1KHz
Voltages DC: 11.5-54V dc
Voltages AC: 100-240V ac 50/60Hz
In rush: 815mA within 4.0ms @ 24Vdc
Stage switching: Negative, positive, voltage free
Safety Integrity Level: SIL1 and SIL2 Route 2H IEC61508 (2010)
Ingress protection: IP66 Type 4/4X/13/3R
Enclosure: High impact UL94 V0 & 5VA FR ABS
Terminals: 0.5 – 2.5mm² (20-14 AWG)
Line monitoring: Diode polarized for use in supervised circuits
Operating: -40 to +66°C [-40° to +151°F]
Storage: -40 to +70°C [-40° to +158°F]
Relative humidity: 99%
Vibration test: 35Hz for a duration 4Hr (UL464)
Jarring test: 3ft/lb Energy (UL464)
Impact test: 3x 5lb (UL464)
MTBF DC: 93.92 years / 822,706 hours – MIL 217
MTBF AC: 46.66 years / 408,508 hours – MIL 217
Weight DC: 2.10kg / 4.62lbs
Weight AC: 2.70kg / 5.94lbs

Current Consumption

Product Version: Nominal Voltage: Voltage Range: Default
Power
Level
Current:		 High
Power
Level
Current:
DC024 12dc
24Vdc
48Vdc		 11.5-54Vdc 376mA
430mA
223mA		 440mA
930mA
453mA
AC230 115Vac 50/60Hz
230Vac 50/60Hz		 100-240Vac 173mA
105mA		 340mA
212mA

Part Codes

Variable: Identifier: Description:
Product type: A121 Alarm horn sounder
Voltage: DC024
AC230		 11.5-54Vdc
100-240Vac 50/60Hz
Back box/cable entries: [e] A Back box with mounting lugs – 2 x M20, 1/2"NPT clearance entries
Stopping plug material: [m] A ABS
Equip. tag/Duty label: [s] 0
1
2		 No equip. tag or Duty label
316 (A4) St/St Equip. tag/Duty label
Metalised Polyester Equip. tag/Duty label
Product version:
[v]		 A UL/cUL, ULC, CPR, MED, DNV, USCG, RMRS, EAC, CE, UKCA – SIL1 & SIL2
Product option:
[o]		 1
Z
X
Y
K		 Standard product
Custom alarm tone software – contact E2S
Custom configuration – contact E2S
Stage control Config. 4
Stage control Config. 5 (DC) and Config. 2 (AC)
Enclosure colour: [x] G
R
S		 Grey
Red
Special colour – contact E2S
Alarm stage control:
Please review the installation manual and wiring schematics for remote stage control and EOL resistor monitoring configuration options:
Config. 1 [DC]: Factory default. Common negative, positive switching. Up to 4 Alarm Stages. EOL monitoring Alarm Stage 1 only
Config. 2 [DC]: User setting. Common positive, negative switching. Up to 4 Alarm Stages. EOL monitoring Alarm Stage 1 only
Config. 3 [DC]: User setting. Common negative, positive switching activation of Alarm Stages 1 & 2 with EOL on both stages. Reverse polarity monitoring
Config. 4 [DC]: Product option ‘Y’. Independent activation of Alarm Stages 1 & 2 with EOL on both stages. Forward polarity monitoring
Config. 5 [DC]: Product option ‘K’. Horn continuously powered. Voltage free activation of up to 3 alarm stages
Config. 1 [AC]: Factory default. Up to 4 Alarm Stages. Stage 1 activated at power on. Stages 2, 3 and 4 via volt free contacts
Config. 2 [AC]: Product option ‘K’. Horn continuously powered. Voltage free activation of up to 3 alarm stages

Approvals

  • UL: UL464
  • cUL: CSA C22.2 No 205-17
  • ULC: CAN/ULC-S525
  • UL EU: (EN54-3) UL-EU-01153-CPR
  • CPR 305/2011: 2821-CPR-0108
  • MED 2023/1667: MEDB000074G
  • MER MSN 1874: MERB000074G
  • DNV GL-CG-0339: TAA00002ZU
  • USCG COA 161-002-68-0
  • EAC CU TR 043/2017: B.00291/21
  • EAC: RU D-GB.GA05.B.12595-20
  • RMRS Marine: No. 19.00193.278
  • SIL1 & SIL2 compliant to IEC61508 (2010)
  • CE, UKCA

Tone Table

Stage 1 WAV file Frequency Description. Stage 2 Stage 3 Stage 4
T 1 1000 Continuous – PFEER Toxic Gas Any T 2 T 44
T 2 1200/500 @ 1Hz Sweeping – DIN / PFEER P.T.A.P. Any T 3 T 44
T 3 1000 @ 0.5Hz (1s on, 1s off) Intermittent – PFEER Gen. Alarm Any T 2 T 44
T 4 1.4KH-1.6KHz 1s, 1.6KHz-1.4KHz 0.5s – NF C 48-265 Any T 24 T 1
T 5 544(100mS)/440 (400mS) – NF S 32-001 Any T 19 T 1
T 6 1500/500 – (0.5s on , 0.5s off) x3 + 1s gap – AS4428 Any T 44 T 1
T 7 500-1500Hz Sweeping 2 sec on 1 sec off – AS4428 Any T 44 T 1
T 8 500/1200Hz @ 0.26Hz(3.3s on, 0.5s off) – NEN 2575 Any T 24 T 35
T 9 1000 (1s on, 1s off)x7 + (7s on, 1s off) – IMO Code 1a Any T 34 T 1
T 10 1000 (1s on, 1s off)x7 + (7s on, 1s off) – IMO Code 1a Any T 34 T 1
T 11 420(0.5s on, 0.5s off)x3 + 1s gap – ISO 8201 Temporal Any T 1 T 8
T 12 1000(0.5s on, 0.5s off)x3 + 1s gap – ISO 8201 Temporal Any T 1 T 8
T 13 422/775 – (0.85 on, 0.5 off) x3 + 1s gap – NFPA Temporal Any T 1 T 8
T 14 1000/2000 @ 1Hz – Singapore Any T 3 T 35
T 15 300 Continuous Any T 24 T 35
T 16 440 Continuous Any T 24 T 35
T 17 470 Continuous Any T 24 T 35
T 18 500 Continuous – IMO code 2 (Low) Any T 24 T 35
T 19 554 Continuous Any T 24 T 35
T 20 660 Continuous Any T 24 T 35
T 21 800 Continuous – IMO code 2 (High) Any T 24 T 35
T 22 1200 Continuous Any T 24 T 35
T 23 2000 Continuous Any T 3 T 35
T 24 2400 Continuous Any T 20 T 35
T 25 440 @ 0.83Hz (0.60s on, 0.60s off) Intermittent Any T 44 T 8
T 26 470 @ 0.9Hz (0.55s on, 0.55s off) Intermittent Any T 44 T 8
T 27 470 @ 5Hz (0.10s on, 0.10s off) Intermittent Any T 44 T 8
T 28 544 @ 1.14Hz (0.43s on, 0.44s off) Intermittent Any T 24 T 8
T 29 655 @ 0.875Hz (0.57s on, 0.57s off) Intermittent Any T 44 T 8
T 30 660 @ 0.28Hz (1.80s on, 1.80s off) Intermittent Any T 24 T 8
T 31 660 @ 3.3Hz (0.15s on, 0.15s off) Intermittent Any T 24 T 8
T 32 745 @ 1Hz (0.50s on, 0.50s off) Intermittent Any T 24 T 8
T 33 800 (0.25s on, 1.00s off) Intermittent Any T 24 T 8
T 34 800 @ 2Hz (0.25s on, 0.25s off) – IMO code 3.a (High) Any T 24 T 8
T 35 1000 @ 1Hz (0.50s on, 0.50s off) Intermittent Any T 24 T 8
T 36 2400 @ 1Hz (0.50s on, 0.50s off) Intermittent Any T 24 T 8
T 37 2900 @ 5Hz (0.10s on, 0.10s off) Intermittent Any T 24 T 8
T 38 363/518 @ 1Hz (0.50s / 0.50s) Alternating Any T 8 T 19
T 39 450/500 @ 2Hz (0.25s / 0.25s) Alternating Any T 8 T 19
T 40 554/440 @ 1Hz (0.50s / 0.50s) Alternating Any T 24 T 19
T 41 554/440 @ 0.65Hz (0.76s / 0.76s) Alternating Any T 8 T 19
T 42 561/760 @ 0.83Hz (0.60s / 0.60s) Alternating Any T 8 T 19
T 43 780/600 @ 0.96Hz (0.52s / 0.52s) Alternating Any T 8 T 19
T 44 800/1000 @ 2Hz (0.25s / 0.25s) Alternating Any T 24 T 19
T 45 970/800 @ 2Hz (0.25s / 0.25s) Alternating Any T 8 T 19
T 46 800/1000 @ 0.875Hz (0.57s / 0.57s) Alternating Any T 24 T 19
T 47 2400/2900 @ 2Hz (0.25s / 0.25s) Alternating Any T 24 T 19
T 48 500/1200 @ 0.3Hz (1.67s / 1.67s) Sweeping Any T 24 T 12
T 49 560/1055 @ 0.18Hz (2.73s / 2.73s) Sweeping Any T 24 T 12
T 50 560/1055 @ 3.3Hz (0.15s / 0.15s) Sweeping Any T 24 T 12
T 51 600/1250 @ 0.125Hz (4s / 4s) Sweeping Any T 24 T 12
T 52 660/1200 @ 1Hz (0.50s / 0.50s) Sweeping Any T 24 T 12
T 53 800/1000 @ 1Hz (0.50s / 0.50s) Sweeping Any T 24 T 12
T 54 800/1000 @ 7Hz (0.07s / 0.07s) Sweeping Any T 24 T 12
T 55 800/1000 @ 50Hz (0.01s / 0.01s) Sweeping Any T 24 T 12
T 56 2400/2900 @ 7Hz (0.07s / 0.07s) Sweeping Any T 24 T 12
T 57 2400/2900 @ 1Hz (0.50s / 0.50s) Sweeping Any T 24 T 12
T 58 2400/2900 @ 50Hz (0.01s / 0.01s) Sweeping Any T 24 T 12
T 59 2500/3000 @ 2Hz (0.25s / 0.25s) Sweeping Any T 24 T 12
T 60 2500/3000 @ 7.7Hz (0.65s / 0.65s) Sweeping Any T 24 T 12
T 61 800Hz Motor Siren Any T 24 T 12
T 62 1200Hz Motor Siren Any T 24 T 12
T 63 2400Hz Motor Siren Any T 24 T 12
T 64 Simulated Bell Any T 21 T 12
For Stage 2 any Stage 1 alarm tone sound can be selected.
Country specific or custom tone configurations and alarm frequencies are available upon request.

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